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x in (-oo:+oo)
4/7 = x/87.15 // - x/87.15
4/7-(x/87.15) = 0
4/7-0.01147447*x = 0
4/7-0.01147447*x = 0 // - 4/7
-0.01147447*x = -4/7 // : -0.01147447
x = -4/7/(-0.01147447)
x = 49.79999686
x = 49.79999686
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